2025/07/27 by Hao-Song You, You, Hao-Song, Xinmei Zhu +7
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Pulsars and Gravitational Waves Research #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2507.20348
openalex publication_date 2025/07/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Within the framework of an equivparticle model employing mean-field approximation, we investigate systematically the mass spectra of color-singlet N-quark configurations with N = 3, 6, 9, 12, 15, and 18, which are assumed to be spherically symmetric with quarks occupying the 1s1/2 state, i.e., compact multibaryon states. At a given quark number N, these states collectively form a single irreducible representation under SU(6) symmetry. Our analysis yields comprehensive mass formulae that characterize these SU(6) multiplets, providing a unified description of their mass spectra. In order to effectively constrain the parameter space of the model and improve the prediction accuracy, we carry out a Bayesian parameter inference based on the experimental masses of eight baryons and D03. The posterior probability density functions and their correlations of the model parameters are examined, based on which we further predict the masses of various multibaryon states and provide their 68% and 90% credible intervals. In our prediction, H-dibaryon, D03, and the dibaryon with S = -6 are all bound states relative to ΛΛ, ΔΔ and ΩΩ thresholds, while slight probabilities of other stable dibaryons (23.64% more stable than Ω- Ξ0 for the state wtih I = (1)/(2), S = -5 and 92.49% more stable than Ξ0Ξ- for the state wtih I = 0, S = -4) and tribaryons (0.25% more stable than Ξ-Ξ0Ξ0 for the state wtih S = -6, I = 1/2; 2.19% more stable than ΛΞ0Ξ- for the state wtih S = -5, I = 0; and 2.21% more stable than ΛΛΞ0 for the state wtih S = -4, I = 1/2) are observed as well. For heavier compact multibaryon states, it is unlikely for them to be stable.